Sunlight can break apart water (and other) molecules in a process called ________.
A. differentiation
B. erosion
C. sublimation
D. photodissociation
Answer: D
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A 4.0-g bead carries a charge of 20 ?C. The bead is accelerated from rest through a potential difference V, and afterward the bead is moving at 2.0 m/s. What is the magnitude of the potential difference V?
A) 800 kV B) 400 kV C) 800 V D) 400 V E) 200 V
A 1.8 kg solid disk pulley of radius 0.11 m rotates about an axis through its center
(a) What is its moment of inertia? (b) Starting from rest, a torque of 0.22 m-N will produce what angular acceleration?
Phase Angles: The figure shows a series ac circuit. The inductor has a reactance of 60 ? and an inductance of 210 mH. A 30-? resistor and a capacitor whose reactance is 80 ? are also in the circuit, and the rms current in the circuit is 2.2 A. What is the phase angle of the circuit?
A. -34° B. 34° C. +90° D. -56° E. 56°
New telescopes are using "adaptive optics.". What is that?
a. using parabolic instead of spherical mirrors b. using computer image processing to enhance images c. building mirrors in hexagonal segments d. continually adjusting the mirror's shape during observations